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JEE Advanced Aldehydes, Ketones and Carboxylic Acids — practice questions — page 3

Explore 122 free Aldehydes, Ketones and Carboxylic Acids questions in JEE Advanced Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Aldehydes, Ketones and Carboxylic Acids questions and exercises with answers

Showing questions 61–90 of 122.

As per your syllabus, Friedel-Crafts ACYLATION of benzene uses an acyl halide + AlCl₃ to generate which electrophile?Read the answer and worked solution →As per your syllabus, which of the following groups is a META-directing substituent on benzene?Read the answer and worked solution →As per your syllabus, halogens (-Cl, -Br) on benzene are which kind of directors despite their deactivating -I effect?Read the answer and worked solution →The general formula for alkanes is:Read the answer and worked solution →Tollens' reagent gives a silver mirror with:Read the answer and worked solution →Match each named organic reaction to its description.Read the answer and worked solution →Match each named organic reaction to its description.Read the answer and worked solution →Match each named reactionRead the answer and worked solution →Which reaction is being described?Read the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →Match each carbonyl testRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →**Wolff–Kishner reduction** uses which reagent to convert $>C=O$ to $>CH_2$?Read the answer and worked solution →Match each named reactionRead the answer and worked solution →**Hoffmann ammonolysis** of alkyl halide with excess $NH_3$ in sealed tube primarily givesRead the answer and worked solution →Why does the Finkelstein reaction proceed efficiently in acetone but not in water?Read the answer and worked solution →**Williamson's synthesis** of ethers couples an alkoxide withRead the answer and worked solution →The Lewis-acid catalyst typically used in **Friedel–Crafts alkylation** isRead the answer and worked solution →For a carbonyl compound to undergo **aldol condensation**, it must haveRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →Tollens' reagent gives a silver mirror with:Read the answer and worked solution →Match each carbonyl testRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →The **Finkelstein reaction** uses which solvent for the conversion $RCl \to RI$?Read the answer and worked solution →$CH_3MgBr$ reacts with $CO_2$ followed by acidic workup. The product isRead the answer and worked solution →Which solvent is essential for preparing a Grignard reagent and why?Read the answer and worked solution →Benzene treated with $CH_3COCl$ and anhydrous $AlCl_3$ givesRead the answer and worked solution →The Wurtz reaction on $CH_3CH_2Br$ with sodium in dry ether gives mainlyRead the answer and worked solution →The **Fittig reaction** couples two molecules ofRead the answer and worked solution →**Kolbe's reaction** treats sodium phenoxide with $CO_2$ under pressure to giveRead the answer and worked solution →

Worked practice questions

As per your syllabus, Friedel-Crafts ACYLATION of benzene uses an acyl halide + AlCl₃ to generate which electrophile?

  1. Carbanion R⁻ alone
  2. Carbene R₂C: alone
  3. Acylium (RC⁺=O ion)
  4. Free-radical R• alone
Show answer and solution

Correct answer: C. Acylium (RC⁺=O ion)

Your syllabus: RCOCl + AlCl₃ → RC⁺=O + AlCl₄⁻ (acylium ion attacks benzene to give acyl benzene).

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As per your syllabus, which of the following groups is a META-directing substituent on benzene?

  1. -NO₂
  2. -OH
  3. -OCH₃
  4. -NH₂
Show answer and solution

Correct answer: A. -NO₂

Your syllabus: -NO₂, -CN, -CHO, -COR, -COOH, -SO₃H are meta directors (also deactivators). -OH/-NH₂/-OR are o/p directing activators.

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As per your syllabus, halogens (-Cl, -Br) on benzene are which kind of directors despite their deactivating -I effect?

  1. Meta only
  2. Ortho/para
  3. Ipso only
  4. Neither type
Show answer and solution

Correct answer: B. Ortho/para

Your syllabus: halogens are o/p directors via +R (lone-pair donation to ring) yet overall deactivating via -I. Unique combination.

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